Link Layer Design for a Military Narrowband Radio Network.

摘要

We are proposing a link layer for a new VHF/UHF narrowband (25 kHz) waveform (NBWF) to be standardised by NATO for combat net radio (CNR). The user requirements are for a networking waveform providing concurrent voice and IP data. The primary voice service is push-to-talk (PTT) multicast to reach all or a predefined group of users in a multi-hop network. The primary vocoder to be used is MELPe, but other vocoders are also required to be supported. We will try to serve multicast voice by reserving resources only when required, including any required automatic relays. Data transfer relies on a combination of contention and reservation. The paper will outline the proposed link layer, with focus on the most challenging services. A simulator is being developed, based on Omnet++. Some results for the performance (delay and probability of success) of multicast voice are presented, in addition to initial performance for data services. Simulation results are compared to analytical estimates.